/*
 * Copyright 2004 original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jbfilter.impl;

import java.util.EnumMap;

import org.hibernate.criterion.Junction;
import org.hibernate.criterion.Restrictions;
import org.jbfilter.core.fcomps.logic.Logic;

/**
 * The filter logic (behavior) for and, or, xor Hibernate filtering.
 * Sorry for the "if else if else if else switch switch" developers : my inner geek loves this design...
 * @author Marcus Adrian
 *
 */
enum _LogicHibernate {
	and(Logic.and) {
		@Override
		Junction getJunction() {
			return Restrictions.conjunction();
		}
	},
	or(Logic.or) {
		@Override
		Junction getJunction() {
			return Restrictions.disjunction();
		}
	},
	xor(Logic.xor) {
		@Override
		Junction getJunction() {
			throw new UnsupportedOperationException("not implemented yet!");
		}
	};
	
	private Logic logic;
	private static final EnumMap<Logic, _LogicHibernate> logic2LogicHibernate = new EnumMap<Logic, _LogicHibernate>(Logic.class);
	static {
		for (_LogicHibernate logicHibernate : _LogicHibernate.values()) {
			logic2LogicHibernate.put(logicHibernate.logic, logicHibernate);
		}
	}

	public static _LogicHibernate fromLogic(Logic logic) {
		return logic2LogicHibernate.get(logic);
	}
	private _LogicHibernate(Logic logic) {
		 this.logic = logic;
	}
	abstract Junction getJunction();

	public Logic getLogic() {
		return logic;
	}
}
